tekmar Difference Setpoint Control 157

Difference Setpoint Control 157

Control Description The Difference Setpoint Control 157 is designed to operate a variable speed pump to transfer heat from a heat source to a storage tank. Varying the speed of the pump provides fast and accurate temperature control to maintain the target temperature difference (ΔT). Additional minimum and maximum setpoints turn off the pump when heat transfer is no longer desirable. Potential applications include using solar collectors or a wood boiler as a heat source.

Literature	—	D 157, A 157, D 001, D 070
Control	—	Microprocessor control; This is not a safety (limit) control
Packaged Weight	—	1.5 lb. (670 g)
	—	Enclosure C, White PVC plastic
Dimensions	—	4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
Approvals	—	CSA certified to CSA C22.2 #142-M and UL # 508
Ambient Conditions	—	Indoor use only, -20 to 120°F (-30 to 50°C), < 90% RH non-condensing
Power Supply	—	24 V ±10% 50/60 Hz 3 VA
Variable Pump	—	120 V (ac) 2.4 A 1/6 hp, fuse T2.5 A 250 V
Pump 2	—	120 V (ac) 5 A 1/3 hp, pilot duty 240 VA
Demand	—	24 V (ac) 2 VA
Sensors Included	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 Two of Universal Sensor 071

Quick
links:

002 003 004 005 007 011 024 031 032 033 039 040 060 062 070 071 072 073 076 077 078 079 080 081 082 083 084 085 090 092 132 150 152 153 155 156 157 161 162 256 257 260 261 262 263 264 265 268 269 270 274 275 279 313 314 315 316 324 325 326 334 335 336 337 345 346 356 360 361 362 363 364 365 369 374 400 401 402 420 421 422 423 440 441 444 479 480 481 482 483 507 508 509 510 511 512 527 528 530 537 538 540 541 542 543 544 545 546 650 664 665 667 704 710 720 741

Literature

Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

Variable Pump

Pump 2

Demand

Sensors Included